Alumina/Glass Composites Fabricated by Melt-Infiltration of Glass into Porous Alumina

2006 ◽  
pp. 129-138
Author(s):  
Yung Jen Lin ◽  
Li Bin Chang
Keyword(s):  
Porous Alumina ◽  
Glass Composites ◽  
Melt Infiltration

Alumina/Glass Composites Fabricated by Melt-Infiltration of Glass into Porous Alumina

2006 ◽  
Vol 313 ◽  
pp. 129-138 ◽  
Author(s):  
Yung Jen Lin ◽  
Li Bin Chang
Keyword(s):  
Activation Energy ◽  
Flexural Strength ◽  
Vickers Microhardness ◽  
Porous Alumina ◽  
Alumina Powder ◽  
Square Root ◽  
Infiltration Process ◽  
Glass Composites ◽  
Melt Infiltration ◽  
Calcium Aluminosilicate

Alumina/glass composites were successfully fabricated by melt-infiltration of glass into porous alumina pellets. Alumina powder was first pressed uniaxially at 100MPa to form disc-shaped pellets, then, heated up to 1200°C for 2 h to form porous pellets with moderate strength for subsequent infiltration. A mixture of calcium aluminosilicate and magnesium borosilicate glass powders were melt-infiltrated into porous alumina at 1200°C ~1250°C by capillary pressure to form composites. The infiltration depths varied with the square root of infiltration time. And the activation energy of the infiltration process was estimated to be 621 KJ/mole. After complete infiltration, the composite had bulk density approaching 3.3 g/cm3 (~ 96% of theoretical density) and open porosity reaching zero, with slight expansion of 0.5% in diameter. Its flexural strength was 150MPa and its Vickers microhardness was about 1000 Kg/mm2.

Chemical Precursor Routes to Nanostructured Non-oxide Ceramics

2002 ◽  
Vol 728 ◽  
Author(s):  
Kersten M. Forsthoefel ◽  
Mark J. Pender ◽  
Larry G. Sneddon
Keyword(s):  
Silicon Carbide ◽  
Boron Nitride ◽  
Boron Carbide ◽  
Structural Control ◽  
Porous Alumina ◽  
Precursor Solution ◽  
Alumina Membrane ◽  
Melt Infiltration ◽  
Efficient Route ◽  
Ceramic Nanofibers

AbstractAn efficient route to boron carbide, boron nitride, and silicon carbide ceramic nanofibers and nanotubules has been developed which employs newly developed molecular and polymeric precursors in conjunction with porous alumina templating methods. Melt infiltration or vacuum filtration of solutions of 6,6 -(CH2)6-(B10H13)2 or polyhexenyldecaborane through alumina templates followed by pyrolysis and dissolution of the membranes in 48% HF yielded boron carbide nanofibers or nanotubules. Boron nitride nanotubules were generated in a similar fashion by employing polyborazylene as a precursor, while silicon carbide nanotubules were generated from the commercially available allylhydridopolycarbosilane (AHPCS) polymeric precursor. In all cases, SEM and TEM analyses showed aligned, monodispersed ensembles of nanofibers or nanotubules. Structural control of the end products can be achieved through changes in concentration of the precursor solution, the number of alumina membrane treatments, and/or pore size of the alumina template.

Influence of Nb on the Interface Structure of Tungsten Fiber Reinforced Zr-Based Bulk Metallic Glass Composites

2005 ◽  
Vol 475-479 ◽  
pp. 3389-3392 ◽  
Author(s):  
Mei Ling Wang ◽  
Xidong Hui ◽  
Guo Liang Chen
Keyword(s):  
Metallic Glass ◽  
Matrix Composite ◽  
Interface Structure ◽  
Eutectoid Reaction ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Glass Composites ◽  
Bulk Metallic Glass Composites ◽  
Melt Infiltration ◽  
Glass Matrix Composites

Zr-based metallic-glass matrix composites, which are reinforced by continuous tungsten fibers, were prepared by melt infiltration casting. The interface structure was analyzed by using X-Ray diffraction, SEM and EPMA. The results illustrate that for the Zr55Al10Ni5Cu30 matrix composite, in addition to the interface diffusion, an interface eutectoid reaction between W fiber and Zr in the liquid state takes place and forms W5Zr3 phase at the interface during casting, the interface is included in Class Ⅲ system; but for (Zr55Al10Ni5Cu30)0.98Nb2 and Zr57Al10Ni12.6Cu15.4Nb5 matrix composite, the addition of Nb restrains the interface eutectoid reaction effectively, which may be attributed to reducing diffusion coefficient of Zr through the interface, and there is only a thinner diffusion layer at the interfaces, the type of interface is changed to the Class Ⅱ system

Porous Alumina Ceramic Prepared by HEMA-TBA Gelcasting System

2017 ◽  
Vol 32 (7) ◽  
pp. 731 ◽  
Author(s):  
XIE Yu-Zhou ◽  
PENG Chao-Qun ◽  
WANG Xiao-Feng ◽  
WANG Ri-Chu ◽  
LUO Feng
Keyword(s):  
Porous Alumina ◽  
Alumina Ceramic

Control of the Structure and Properties of Acoustic Materials on the Basis of Foam Glass Composites

2018 ◽  
Vol 760 (6) ◽  
pp. 41-44 ◽  
Author(s):  
V.S. LESOVIK ◽  
◽  
S.V. ALEKSEEV ◽  
I.V. BESSONOV ◽  
S.S. VAISERA ◽  
...  
Keyword(s):  
Foam Glass ◽  
Structure And Properties ◽  
Glass Composites
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